Diodes Incorporated RS2B-13-F

Overview

RS2B-13-F from Diodes Incorporated is a surface-mount fast recovery rectifier diode rated for 100 V peak repetitive reverse voltage, 1.5 A average forward current, and 50 A non-repetitive surge current, with 150 ns reverse recovery time and 1.3 V forward voltage at 1.5 A. It is used in AC/DC input stages, DC-DC converter freewheeling paths, and auxiliary power supplies where fast switching and thermal robustness are required.

For engineers reviewing the RS2B-13-F datasheet, RS2B-13-F pinout, RS2B-13-F application, or RS2B-13-F equivalent, key selection criteria include its 100 V V_RRM, 150 ns t_rr, SMA package thermal resistance (20 °C/W), RoHS-compliant matte tin plating, and suitability for automated SMT assembly in industrial and consumer power supplies.

Technical Context

This device operates as a unidirectional silicon PN junction rectifier optimized for high-efficiency switching power conversion. Its glass-passivated die construction ensures stable reverse leakage (<5 µA at 25°C) and reliable operation across –65°C to +150°C junction temperature range.

The fast recovery characteristic (t_rr = 150 ns under IF = 0.5 A, IR = 1.0 A, Irr = 0.25 A) minimizes switching losses in 50–100 kHz SMPS topologies. Its 30 pF typical junction capacitance at 4 V reverse bias supports predictable high-frequency behavior in snubberless designs.

Key Specifications

Pinout & Package

RS2B-13-F is housed in the SMA (DO-214AC) surface-mount plastic package with cathode band polarity marking. The package features molded UL 94V-0 plastic body, matte tin-plated terminals solderable per MIL-STD-202 Method 208, and moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fast recovery rectifier applications.

Compared with STTH1L06S and MBR15100CT, RS2B-13-F offers optimal balance of voltage rating, thermal performance, and SMT manufacturability for ≤100 V, ≤1.5 A applications-delivering lower system cost than TO-220 alternatives and better surge robustness than Schottkys in transient-prone environments.

Availability

RS2B-13-F is available at Aetrix Electronics and suitable for AC/DC adapters, industrial power supply auxiliary rails, and LED driver secondary-side rectification requiring stable component supply, consistent parametric performance, and full traceability.

Supply support for RS2B-13-F includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and the Americas.

The RS2x series belongs to Diodes' general-purpose fast recovery rectifier product line, engineered for cost-effective, thermally efficient AC/DC and DC/DC power conversion in consumer, industrial, and computing applications.

FAQ

What is the maximum junction temperature and how does it affect layout?

The RS2B-13-F has a rated junction temperature range of –65°C to +150°C. Its thermal resistance (R_θJT = 20 °C/W) means that at 1.5 A continuous current and 1.3 V forward drop (1.95 W dissipation), the junction rises ~39°C above terminal temperature. To stay within 150°C, the PCB copper pad must remain below 111°C-achievable using ≥5 mm² of 1 oz copper with thermal vias to inner layers.

Is RS2B-13-F qualified for automotive use?

RS2B-13-F is not AEC-Q101 qualified out-of-the-box. Diodes offers automotive-grade variants (e.g., RS2B-13-F-A) with PPAP documentation, IATF 16949 manufacturing, and extended testing. Standard RS2B-13-F may be used in non-safety-critical automotive subsystems only after customer qualification per AEC-Q100/101 requirements.

How does the 150 ns reverse recovery time impact EMI in a 65 kHz flyback converter?

At 65 kHz, the 150 ns t_rr corresponds to ~10% of the switching period (15.4 µs), resulting in measurable reverse recovery current spikes. These spikes excite parasitic LC networks, increasing common-mode noise. Layout mitigation-tight anode-cathode loop area, local RC snubbers, and ferrite beads on cathode traces-is recommended to meet CISPR-22 Class B limits.

Can RS2B-13-F replace a 1N4007 in a low-frequency linear power supply?

Yes, RS2B-13-F can replace 1N4007 in most linear supplies, offering faster recovery (150 ns vs. 30 µs), lower forward drop (1.3 V vs. ~1.1 V at 1 A), and superior surge rating (50 A vs. 30 A). However, its lower V_RRM (100 V vs. 1000 V) restricts use to ≤100 V RMS input circuits-verify transformer secondary voltage before substitution.